Eryngium yuccifolium Michaux var. synchaetum A. Gray ex Coulter & Rose. Southern Rattlesnake-master. Phen: Jun-Aug. Hab: Wet savannas, especially those over calcareous clay soils. Dist: A Southeastern Coastal Plain endemic: se. NC to s. FL and west across the Gulf Coastal Plain, the exact range limits obscure.

Origin/Endemic status: Endemic

Taxonomy Comments: Possible taxa that warrant taxonomic standing The distinction between the two varieties, seemingly clear in NC and elsewhere in states bordering the Atlantic, seems to become less straightforward farther west, as in LA and AR. In NC it has been seen in Pender, Brunswick, Columbus, Bladen, and Robeson counties.

Synonymy: = K1, K3, K4, MC, RAB, Tx, Bell (1963); = Eryngium synchaetum (A.Gray ex Coult. & Rose) Coult. & Rose – S; < Eryngium yuccifolium Michx. – Fl7, GW2, NcTx, Ok, WH3

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FAC (taxonomic split from wetland indicator species)
• Great Plains: FACW (taxonomic split from wetland indicator species)
• Midwest: FAC (taxonomic split from wetland indicator species)
• Northcentral & Northeast: FAC (taxonomic split from wetland indicator species)

Heliophily ?: 9